Cita APA (7th ed.)

Zim, H. S. (1961). Rocks and how they were formed. Golden Press.

Cita Chicago (17th ed.)

Zim, Herbert Spenser. Rocks and How They Were Formed. New York: Golden Press, 1961.

Cita MLA (9th ed.)

Zim, Herbert Spenser. Rocks and How They Were Formed. Golden Press, 1961.